<?
if ($_SERVER['REQUEST_METHOD'] != 'GET') { EXIT(-1); }
$data = file_get_contents("backup.xml"); // lấy dữ liệu từ file 
preg_match_all('/<content:encoded>(?<match>.*)<\/content:encoded>/', $data, $content);
$content = $content['match'];
echo substr($content[$_GET['id']], 9);
?>